Today the FDA approved Priorix for the prevention of measles, mumps and rubella in individuals 12 months of age and older. Measles is an acute viral respiratory illness that is characterized by a prodrome of fever, malaise, cough, coryza, and conjunctivitis, and pathognomonic enanthema (Koplik spots) followed in 1- 2 days by a maculopapular rash. Signs and symptoms usually appear